We fill this binder and it carried around for two days each month for four months. Holds up to being opened and closed many times! Great binder to use.
I have purchased 4 of these heavy duty binders over the past 2 years. In the last couple months one of them won't keep the bottom ring closed like it should. It will not stay closed which makes the paper slip out every time you flip through the pages. Very irritating as you have to open up the binder and put the pages back in the ring.